Sage Weil | c30dbb9 | 2009-10-06 11:31:07 -0700 | [diff] [blame] | 1 | |
| 2 | #include "ceph_debug.h" |
| 3 | #include "buffer.h" |
Sage Weil | c7e337d | 2010-02-02 16:11:19 -0800 | [diff] [blame] | 4 | #include "decode.h" |
Sage Weil | c30dbb9 | 2009-10-06 11:31:07 -0700 | [diff] [blame] | 5 | |
Sage Weil | b6c1d5b | 2009-12-07 12:17:17 -0800 | [diff] [blame] | 6 | struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp) |
Sage Weil | c30dbb9 | 2009-10-06 11:31:07 -0700 | [diff] [blame] | 7 | { |
| 8 | struct ceph_buffer *b; |
| 9 | |
| 10 | b = kmalloc(sizeof(*b), gfp); |
| 11 | if (!b) |
| 12 | return NULL; |
Sage Weil | b6c1d5b | 2009-12-07 12:17:17 -0800 | [diff] [blame] | 13 | |
| 14 | b->vec.iov_base = kmalloc(len, gfp | __GFP_NOWARN); |
| 15 | if (b->vec.iov_base) { |
| 16 | b->is_vmalloc = false; |
| 17 | } else { |
| 18 | b->vec.iov_base = __vmalloc(len, gfp, PAGE_KERNEL); |
| 19 | if (!b->vec.iov_base) { |
| 20 | kfree(b); |
| 21 | return NULL; |
| 22 | } |
| 23 | b->is_vmalloc = true; |
| 24 | } |
| 25 | |
Sage Weil | dd26d85 | 2009-12-05 10:13:33 -0800 | [diff] [blame] | 26 | kref_init(&b->kref); |
Sage Weil | b6c1d5b | 2009-12-07 12:17:17 -0800 | [diff] [blame] | 27 | b->alloc_len = len; |
| 28 | b->vec.iov_len = len; |
| 29 | dout("buffer_new %p\n", b); |
Sage Weil | c30dbb9 | 2009-10-06 11:31:07 -0700 | [diff] [blame] | 30 | return b; |
| 31 | } |
| 32 | |
Sage Weil | dd26d85 | 2009-12-05 10:13:33 -0800 | [diff] [blame] | 33 | void ceph_buffer_release(struct kref *kref) |
| 34 | { |
| 35 | struct ceph_buffer *b = container_of(kref, struct ceph_buffer, kref); |
Sage Weil | b6c1d5b | 2009-12-07 12:17:17 -0800 | [diff] [blame] | 36 | |
| 37 | dout("buffer_release %p\n", b); |
Sage Weil | dd26d85 | 2009-12-05 10:13:33 -0800 | [diff] [blame] | 38 | if (b->vec.iov_base) { |
| 39 | if (b->is_vmalloc) |
| 40 | vfree(b->vec.iov_base); |
| 41 | else |
| 42 | kfree(b->vec.iov_base); |
| 43 | } |
| 44 | kfree(b); |
| 45 | } |
| 46 | |
Sage Weil | c30dbb9 | 2009-10-06 11:31:07 -0700 | [diff] [blame] | 47 | int ceph_buffer_alloc(struct ceph_buffer *b, int len, gfp_t gfp) |
| 48 | { |
| 49 | b->vec.iov_base = kmalloc(len, gfp | __GFP_NOWARN); |
| 50 | if (b->vec.iov_base) { |
| 51 | b->is_vmalloc = false; |
| 52 | } else { |
| 53 | b->vec.iov_base = __vmalloc(len, gfp, PAGE_KERNEL); |
| 54 | b->is_vmalloc = true; |
| 55 | } |
| 56 | if (!b->vec.iov_base) |
| 57 | return -ENOMEM; |
| 58 | b->alloc_len = len; |
| 59 | b->vec.iov_len = len; |
| 60 | return 0; |
| 61 | } |
| 62 | |
Sage Weil | c7e337d | 2010-02-02 16:11:19 -0800 | [diff] [blame] | 63 | int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end) |
| 64 | { |
| 65 | size_t len; |
| 66 | |
| 67 | ceph_decode_need(p, end, sizeof(u32), bad); |
| 68 | len = ceph_decode_32(p); |
| 69 | dout("decode_buffer len %d\n", (int)len); |
| 70 | ceph_decode_need(p, end, len, bad); |
| 71 | *b = ceph_buffer_new(len, GFP_NOFS); |
| 72 | if (!*b) |
| 73 | return -ENOMEM; |
| 74 | ceph_decode_copy(p, (*b)->vec.iov_base, len); |
| 75 | return 0; |
| 76 | bad: |
| 77 | return -EINVAL; |
| 78 | } |